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很长时间以来,人们就已经知道北太平洋深海沉积物中含有上新世晚期到更新世期间的冰载碎屑沉积层(IRD).但在深海钻探计划第145航次实施以前,尚无高分辨率的记录来建立详尽的古海洋和古气候历史.在本项研究中,我们将北太平洋冰载碎屑沉积带上两个站位(882站位、883站位)的高分辨率γ射线衰减孔隙度评价仪高分辨率的密度记录(GRA-PE)与来自格陵兰summit冰芯中的氧同位素记录作了对比,其中882站位(北纬50°21.8′,东经167°36.0′),和883站位(北纬51°11.9′,东经167°46.1′)分别钻自北太平洋的地催特海山水深3244米和2385米处.本项研究所用的γ射线衰减孔隙度评价仪(Gamma RayAttenuation Porosity Evaluator)最初是由莫若桑石油公司的科学家研制.在大洋钻探计划中就是用这种仪器来测定穿过未劈开岩芯γ射线的衰减情况,由计算机控制的驱动器把岩芯在γ射线源和计数器之间缓慢移动(在150cm的剖面上).假定矿物的衰减系数恒定不变,那末,γ射线的计数值就直接和矿物湿容状态下的密度有关.海洋沉积物中,湿容状
It has been known for some time now that deep-sea sediments in the North Pacific contain ice-bearing sediments (IRD) from the Late Pliocene to the Pleistocene, but there is no high-resolution prior to the implementation of Deep Sea Drilling 145th Voyage Rate records to establish detailed paleoclimate and paleoclimate history.In this study we brought high resolution gamma rays from two stations (882 stations, 883 stations) to the North Pacific Ocean ice- Attenuation Porosity Evaluator The high-resolution density record (GRA-PE) is compared with the oxygen isotope records from the ice core in Greenland, of which 882 stations (50 ° 21.8 ’N, 167 ° 36.0’ E) and 883 stations (51 ° 11.9 ’N, 167 ° 46.1’ E) were drilled respectively at depths of 3244 m and 2385 m from the dikes in the North Pacific Ocean.The Gamma Ray Attenuation Porosity Evaluator was originally developed by a scientist at Morosang Oil Co. The instrument used to determine the attenuation of gamma rays through unpartured cores in an ocean drilling program is a computer- And between the counters The slow moving (150cm in the cross section). Assumed attenuation coefficients minerals constant, then the count value γ rays on mineral density and wet content is directly related to the state of marine sediments, wet-like container